Reduce size of fast-import marks file by not persisting file-level marks

Use two allocators for marks, one persistent commit counter that starts at 0
and counts up commits, and a transitional counter, for files, that counts down
from maxMark, and is reset on each SVN revision.

Note that the marks file will still have marks for some, but not all, files.
The number of such marks is limited by the size of the SVN revision that affects
the most files.

For instance, this changed the size of one marks file from 19M to 3.2M.

fast-import issues: We currently set maxMark = (1<<20)-1.  Anything large seems
to trigger a bug in the sparse array dumping routine in git-fast-import in
certain versions of git.

1 files changed, 10 insertions, 1 deletions

diff --git a/src/repository.h b/src/repository.h
index f7beb99..728b2ab 100644
--- a/src/repository.h
+++ b/src/repository.h
@@ -97,12 +97,21 @@ private:
     QProcess fastImport;
     int commitCount;
     int outstandingTransactions;
-    int lastmark;
+
+    /* starts at 0, and counts up.  */
+    int last_commit_mark;
+
+    /* starts at maxMark and counts down. Reset after each SVN revision */
+    int next_file_mark;
+
     bool processHasStarted;
 
     void startFastImport();
     void closeFastImport();
 
+    // called when a transaction is deleted
+    void forgetTransaction(Transaction *t);
+
     friend class ProcessCache;
     Q_DISABLE_COPY(Repository)
 };